Radiation-pyrometer.



R. P. BROWN.

RADIATIONPYROMETBR.

APPLICATION 211.21) mm: 2, 1910.

Patented Mar. 10, 1914i Warm 1 INVtNTEiR V ATTORNEY unrrnn sra'rsranur Fr es;

RICHARD r. BROWN, or PHILADELPHIA, PENNSYLVANIA.

To all ux/1.0m 1' t m 1;2 concern Be it "known that I, RICHARD I. Buows', a citizen of the United States, and a resident of the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Radiationlyrometers, of which the following is a specification.

' hllyinvention relativeto improvementsin pyrometers and more particularly to improvements in that type of pyrometer' used to measure the radiant heat of a body, and the object of my invention is to furnish in connection with such a pyrometer a means which will serve the double purpose of a tional elevation of a radiation pyrometer embodying my invention; and Flg. 2, a plan.

of Fig, 1.

1 is the pyrometer tube, 8 a condensing mirror, 10 a heat sensitive member, in the present case a thermometer, upon which the heat rays entering the tube at its front end are focused by. the mirror. 11 is a removable cap carrying the mirror 8, 1G a sliding scale ,carriedby the case 17 which protects the thermometer, 18 a pointer carried by scale 16. The case 17 is slotted Hill 19. 20 is a screw and thumb nut for securing the scale 1 to case 17. All. of these parts are so well known that detailed description of them will be unnecessary. I

' The tube 1 isprovided with a reflecting: device which" constitutes an operative part of the pyroineter. This reflecting device, which in its structure is similar to .the ordinary camera finder-,is disposed on the tube "normally in fixed relation to the open end device and to.

hereof; to the heat sensitive the heat ray concentraton. 'lhejrcflecting device has a field of incidence corresponding to the field of incidence of such tube. The reflecting device is operative to perform the function of-sighting the radiant object and also the function of indicating by an exclusively incandescent image of reflection aproper temperature registering range of the instrument for registering the tempera- BADIATION-PYROMETER.

v Specification of Letters latent. Patented Mar; 10, 1914, Application filed me 2, 1910. Serial No. 564,593.

tulre of the radiant object through theheat object simultaneously with the entry inthe reflectingdevice ofthe light rays forming such incandescent image.

The term inifiidescent image of reflectlOIl as here used has reference exclusively to the red heat or white heat of a radiant ob ect as seen through the observation openmg of a furnace in bl ast-or other exposure of such object. v a 12 is a plateisecured to the outside bf the tube 1. i

ries an inclined mirror 5.

mirror is placed at or about lidegrees with a line parallel with the axis oi'tube opening at the frontend of the tubeilf the length of this tube, and the location' oz' the condensing 'rometers it is necessary that rays from t e hot object only enter the tube, for instance: if it be desired to measure the: temperature of the interior of a furnace the rays from the furnace opening only, to the exclusion of any from objects surrounding the opening, should enter the tube, hence if an observer looking through the finder sees therein the full furnace opening and does not see any of the sides of this opening, he knows that his instrument is directed to the opening and is at the proper distance therefrom to obtain a correct indication of its temperature.

.Tninstruments of this class it ieilnmaterial how close the instrument is to the hot body, it must not,however, be far enough away to permit the entrance of rays other Having thus described my invention'l claim as new anddesire to secure by Letters Patent: A radiation pyrometer for registering-the radiant heat of an object, said instrument comprising a tube open atone end for the entrance of the heat rays from said object, a heat sensitive device carried interior-1y o 6 is a box, carried by plate 12, which car 15 is aperture in the front of'the box] 6, 7 a lens closing the top of box 6. The

The relation between the finderiand the tlian those passing from the hot body itself.

rays whichenter said tube from'the radiant mirror therein being constanhj field of view corresponds with that ,of the through the finder precisely asit would be readings may be obtained by radiation 1) f a 5 ing said tube upon said heatsensitive de- 10 vcorresponding" with the field of incidence of said tuhe, a temperature indicator carried exterioriy of said tube and connected with said. heat sensitive-device, a ray concentrator operative to concentrate the heat rays enter- 1 vice, and a reflecting device disposed on said tube normally in fixed relation to said open end said heat Sensitive device. and said concentrator and havin a field of incidence i l l l l said tube and opei ative to perform the dou- E l ble function of sighting the radiant object and indicating by an exclusively incandescent image of reflection a proper temperature -registering range of the instrument feiregistering the temperature of the radiant object through the heat rays entering said tube from said object simultaneously with the entry in the reflecting device of the light rays forming said image.

RICHARD-P. BROWN. \Vituesses A. H. VAIL,

CHARLES A. BUTTER. 

